Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af41e2f0240df52…

MALICIOUS

PDF

42.3 KB Created: 2020-08-15 03:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2279c3bfda6327617b1534156184a2d SHA-1: 19ae4d5f02af922f1f3d6aacd6c67ce396e9bc37 SHA-256: 0af41e2f0240df526d5dcb034a0eda806c1f9860d007d9a2361c684378842f19
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Astrology kundali app' and includes the malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=astrology+kundali+app
    • http://files.mayusilkart.org/uploads/1/3/1/3/131383664/2245704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/activated_carbon_research.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1364/files/79213653981.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/78972709428.pdf
    • https://cdn.shopify.com/s/files/1/0437/7395/2158/files/fesumidojipawibejenona.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/mafipekuzuzekadofexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/33893884973.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/suvutetapedudelulubome.pdf
    • https://cdn.shopify.com/s/files/1/0452/5346/0130/files/adolescent_brain_development_prefrontal_cortex.pdf
    • https://cdn.shopify.com/s/files/1/0436/9098/3574/files/dovomazul.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/61656076718.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0807/files/72951238330.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aef.bin
00c1ce6c4c72477f34b95c69d27770da37400798e1a4dc5cc30dd607ea8fceb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEF 5044 bytes
font_01_sfnt_off00006c1c.bin
3b04efbf1bb70f7704c2f352135bbde19200a7b70979421d98271e7f25f106da
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1C 10032 bytes
font_02_sfnt_off00008e6a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6A 4324 bytes